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Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- From: Michael Matz <matz at suse dot de>
- To: Jan Beulich <JBeulich at suse dot com>
- Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, Binutils <binutils at sourceware dot org>
- Date: Tue, 12 May 2015 17:37:41 +0200 (CEST)
- Subject: Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Authentication-results: sourceware.org; auth=none
- References: <20150511212331 dot GA1838 at intel dot com> <5551F4E70200007800079575 at mail dot emea dot novell dot com> <CAMe9rOpDbkeFbmNbQh0a1AKhAQy-cH4HJu20o_ERQaoR6sTxbQ at mail dot gmail dot com> <55520C440200007800079718 at mail dot emea dot novell dot com> <CAMe9rOpFgSyJm-oceuDkrBYnBQGv01ywCc43WySqX21NTJYi4Q at mail dot gmail dot com> <555216370200007800079773 at mail dot emea dot novell dot com> <CAMe9rOpOx=SSUZnCFimn4fBzFqNRDch8QYLn3Os_y7EfQH65Qw at mail dot gmail dot com> <5552318402000078000798A8 at mail dot emea dot novell dot com> <CAMe9rOoqcr7aE8dr6E44KUK6JLrNMNcDNFFWhcb6K+14M=Y+=w at mail dot gmail dot com> <555233B602000078000798EF at mail dot emea dot novell dot com> <CAMe9rOrOS+K0R+r1jHCNwAkgrhjftHUOGt_wTuP8wRYcPdifmQ at mail dot gmail dot com> <555235930200007800079911 at mail dot emea dot novell dot com>
Hi,
On Tue, 12 May 2015, Jan Beulich wrote:
> I don't think so - this looks quite okay. It would become more of an
> issue when looking at other than relocatable object files (namely when
> their image base is non-zero), or ones with .text exceeding 32k.
Actually also that one is correctly printed I think (from a hello world
main, where I added a jmprel16 +0):
000000000040055c <main>:
40055c: 55 push %rbp
40055d: 48 89 e5 mov %rsp,%rbp
400560: 48 83 ec 30 sub $0x30,%rsp
400564: c6 45 d1 00 movb $0x0,-0x2f(%rbp)
400568: c6 45 d0 61 movb $0x61,-0x30(%rbp)
40056c: 48 8d 45 d0 lea -0x30(%rbp),%rax
400570: 48 89 c2 mov %rax,%rdx
400573: be 44 06 40 00 mov $0x400644,%esi
400578: 66 e9 00 00 jmpw 57c <_init-0x3ffe8c>
000000000040057c <next>:
40057c: bf 52 06 40 00 mov $0x400652,%edi
...
It shows that rip is going to be truncated.
Ciao,
Michael.
- References:
- [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
- Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches